You are asking a lot of questions (in your link) that are really more appropriately posed to an attorney hired to represent you in a case. It is a detailed and long thread, too long to get into for this post.
In brief, a judge will sometimes ask you to provide proof of service of a discovery request. What the judge is asking you to provide the court is a document that says you sent the request and hopefully a document that says the request was received. So I understand why the judge didn't want another discovery request; rather, the judge wanted proof of service.
Second, if the officer doesn't show up and the officer was subpoenaed, then you can request that the case be dismissed. ****CAUTION**** I know you didn't do this on your own, but it is generally a bad idea to subpoena an officer in an infraction case. Many people think it's smart - it is generally not. You might get lucky though.
Good luck with your case.